@book{+1975,
url = {https://doi.org/10.1515/9783112597583},
title = {Zu Problemen der Demographie},
title = {Materialien des Internationalen Demographischen Symposiums Berlin 16.–18. Dezember 1974},
editor = {Siegbert Fröhlich and Parviz Khalatbari},
publisher = {De Gruyter},
address = {Berlin, Boston},
doi = {doi:10.1515/9783112597583},
isbn = {9783112597583},
year = {1975},
lastchecked = {2026-05-01}
}